Dash-pot for spring-scales and the like.



2O l inater described, andparticulary pointed an o ening 5,

of the springs as soon as t e UNITED sTATEs PATENT OFFICE.

LAWRENCE P. WELELEY, OE BRIDGEPORT, CONNECTICUT, ASSIG'NOE 'TO vvTHE A UTOMATicfsoALEIQOMPANY, A CORPORATION OE NEW JERSEY;

DASH-POT FoaA SPRING-'SCALESA'ND THE LIKE.

Specication of `Letters Patent.

Patented July 17,

Original application illed November 8, 1904, Serial No. 251,952. Divided and this application led July 26,1905. Serial No.v271|8 68 .To aZZ'whom it may con/Germ' Be it known that I, LAWRENCE P. WEL- FLEY, av citizen of the United States, residing at Bridgeport, Connecticut, have invented certain newv and useful Improvements in Dash-Pots for lSpring-Scales and the Like, of which the following is `a specification.

' lMy invention has been desi nedin order to overcome the vibration of tie springs in' a weighing-scale, and'at the same time I have A aimed to provide a device which will oiier no resistance to the downward h t e vibrations ofthe springs as soon as they ave fully distended, divine" to'l the Weight' of the goods placed on ne p an. I do not wish, owever, to limit my invention to use in connect'ion with spring-scales.

The invention consists in the features and combination and arrangement of arts here- Out in the claims.

So far as the main features of the invention are concerned this application-.is a division of -that iiledby me November 8, I19051, Serial N o 231,952-,`

AIn the drawings, Figure I1 is aside view of the improved dashot. Fig. 2 1s a sectional view o thepsame. ig. 3 is aplan view of the invention.

In order to overcome the vibration of the springs in the-scale and at the same time provide a device which i the downward movement of the parts in the act of weighing and will sto thevibrations springs have fully distended, due to the weight placed on the pan, I have lrovided' a special form and arrangement of ash-pot or device associated with .the platform weighing mechanism. device consists of a cylinder 1, having which it "may be secured. This cylinder as 'within it a second cylinder 3, vpreferably cast therewith and having a space 4 between the two cylinders. These 'cylinders communicate vwith each other fthrough extending through the wall at the ower end of the inner cylinder. 4This Opening is regulated as to size by a valve 6, consisting of a cylindrical rod extending verticallyin the space between the cylinders, the lower end of the cylindrical rod being cut away at 7, so that by turning the said rod the portion isopposite the said opening or bf "turning the rod until the 7 y cut-away portion 1s movement ofthe parts in the act of weighing and will stopl will oiier no resistance to" vof ope 'l ects may be secured, owin to the different v areas of the port thus aifor Aed between the two cylinders. f

Within the inner cylinder a piston or plunger of any suitable form reci rocates.- This piston may be described as eing enerally of globular form inthat it has roun ed bearing-surfaces 8, engaging with the inner pe# riphery of the inner cylmder, theupper and lower-portions of the said piston or plun er being Vof a smaller diameter than the mid' le portlon.. The piston or plunger is hollow and contains a ball-valve-Q, adapted toa seat 10, having an openin the liquid contained in -the cylinders is free tolpass when the ball-valve w1 plunger is further yprovided with ports 1 2, connecting its interior with the interior of the inner cylinder. The pistonis rigidly connected. with a rod 13, which in, turn is suitably connected with the scale. The arrangement is such that in the vertical movement of the piston it may have slight rocking` movement, due to its globular shape, against the interior walls of the inner cyliner. ysupposing` the cylinders to contain `the appro riate 'amount of liquid, the action is as fo ows: When the under the action,of the rial placed upon the and the springs are stended bythe said weight, the oil or other iiuid contained in the inner cylinder is forced through the piston or plunger, for wliichpurpose the ball-valve rises from its seat, and this passesout through the ports 12 of the inner cy' plunger. This allows the piston or plun er to deseen with comparative freedom, which may, however, be regulated-by the amount of the ort 5 but as soon as the hmit of ownwar movementof the parts has been/reached, due to the weight of the material or article placed on the scale pan or platform, vibration ofthe connections will be checked by the action of the piston or plun er, for upward movement of the parts will e checked or prevented by the valve seating itself at once, and thus preventin the free flow of the liquid therethrough, an consequently the piston will now tion action and its upward movement will be retarded corresponding to the degree of weight of the mateinto the partA 11, through which lnder above vthe piston or have a sucl is oif its seat,vas be hereinafter described. The piston or piston is depressed IOO IIO-

-into the outer cylin er.

openin of the port 5. In other words, the" upwar movement of the piston due to the tendency of the parts to vibrate when the vsprings are distended, causes the closing of 'piston,which is filled only by suction through the port 5, and as this port can 4be regulated as to its area the action of the piston can be nicely adjusted.

As above stated, the piston-rod is rigidly connected with the piston, while the latter itself is adapted to have a certain amount of (rocking movement on the walls of the cylin- It will be noticed that the inner cylinder is open `at the top and is of lessheight than the outer cylinder. Any liquid which gets above the piston will when said piston rises discharge' over the to of the inner cylinder The valve-rod 6 extends through the top or head of the outer cylinder and has connected therewith a lever or arm 14, by which the valve-rod may be turned. A segment 15, having notches, is adapted to be' engaged b the said lever, whereby the valve-rod Wilbe held. in adjusted position.

I prefer to hold the head of the outer cylinder in place by means of lclips 16, consistling of flat pieces of metal arranged at an inclination and bearin the under side of the of. the outer cylinder screws 17, passing at their ends against ead and the inner side through the head an into the said clips,

' serving to draw the parts into close contact.

The opening in the .upper cylinder-head is lar er than the diameter of the piston-rod.

n Fi 2 I show a leaf or spring blade 17 attache at its upper end to the inner cylinder and with its lower end'normally sprung away from a port 18 at the bottom of the inner cylinder, connecting the interior of the inner cylinder with the space 4 between the two cylinders.

The action is as follows: The upward movement of the piston creates a suction in the inner cylinder, which causes the springb'lade to be drawn inwardly and to close over the port 18. At the end of the upward stroke of the piston the suction action ceases in its eHect on thespring-blade, which now' at its lower end springs awa from the porty 18 and opens the same. T -s will entirely destroy any suction or partial vacuum which may be present in the inner cylinder such as would exert an undesirable influence on the iston. With this form of dashot all the eatures before described are inclu ed in ractice.

' .claimy l 1. Means for arresting vibration consisting of aninner cylinder, a valved piston therein, an outer cylinder communicatin with the inner cylinder at its lower end t ough an openin and also with said cylinder at its ulpper en the water bein free to pass from t e top of the inner c lin er throu h the space between the cylin ers and into t e inner cylinder at the bottom, and means for controlling the lower opening leading to the inner cylinder consisting of a rod extending between the cylinders from the lower end thereof and outthrough the top of the casing, substantially as described. y

2. In-combination with the cylinder and piston with an opening in the cylinder for the iow of fluid therethrough, said cylinder v4being surrounded b an outer chamber, an automatic closure or the opening adapted toclose under the action of the plston suction and adapted to o en as the suctionressure ceases at the en of lthe piston-stro e, substantially as described.

3. In combination wlth the cylinder and 'piston with an opening in the cylinder for the flow of iiuidtherethrough, said cylinder being surrounded by an outer chamber, an automatic closure foitheopenin adapted to close under the action of the piston-suction and adapted to o en as the suction pressure ceases at the en of the piston-stroke, 'said closure consisting of a leaf-spring having'its free end closing the opening, substantially as described.

4. In combination"'with the cylinder and pist0n,'av spring-valve arranged to' be closed by the suction within the cylinder created-- b the piston, said valve openingautornatic-` a ly asthe piston ceases its movement, substantially as described.

IOO

In testimony whereof I afx my signature" Y in presence of two witnesses.

.LiiwRENcE-- P. WELFLEY. VVitnessei': If WILLLAM LoUNsBURY, f WELLINGTON Karmann.V 

